attorney says if he indicates -- uncovers enough evidence, he will ask the fbi to conduct an investigation. >> reporter: vinita nair, wjz eyewitness news. >> federal prosecutors add, even if they determine johnson's death was a crime, they may not have jurisdiction to pursue the case. >>> convicted sniper, lee boyd malvo is challenging his sentence to life without parole. >> reporter: they argue malvo's petition should be dismissed. he was convicted for his role in the 2002 sniper shootings that killed 10 people and wounded three others. malvo, who was 17 at the time of the killings, argues his life without parole sentence should be dismissed because of a recent supreme court decision, outlawing mandatory life sentences, without parole for juveniles. the virginia attorney general's office, also support a similar challenge in that state. >> malvo's accomplice, john allen muhammad, was sentenced to death and executed in virginia in 2009. >>> as the civil war rages on in syria, an international chemical weapons watch dog group says tacountry has destroyed the equipment used to make chemical w